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Quotation from Beyond Good and Evil by Friedrich Nietzsche

“He who fights with monsters should be careful lest he thereby become a monster. And if thou gaze long into an abyss, the abyss will also gaze into thee”

Friedrich Nietzsche (spoken by Nietzsche)

Beyond Good and Evil, Part Four, §146, trans. Helen Zimmern (1906)

Portrait of Friedrich Nietzsche

Nietzsche's most-quoted aphorism, a warning about the reciprocal effect of what one opposes or contemplates.

Citation: "He who fights with monsters should be careful lest he thereby become a monster. And if thou gaze long into an abyss, the abyss will also gaze into thee" — Friedrich Nietzsche, Beyond Good and Evil, Part Four, §146, trans. Helen Zimmern (1906). (id beyond-good-and-evil-q8)

Portrait: Nietzsche187a, Friedrich Hermann Hartmann, Public domain.

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Quote card: He who fights with monsters should be careful lest he thereby become a monster.